<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addDialogVisible = true">添加角色</el-button>
        </el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="rolelist.data" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom',i1 ===0?'bgtop':'','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限  -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for 循环嵌套渲染二级权限 -->
                <el-row :class="[i2===0?'':'bgtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="danger" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column label="序号" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeUserById(scope.row.id)">删除</el-button>
            <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>

    </el-card>
    <!-- 新增角色对话框 -->
    <el-dialog title="新增角色" width="50%" :visible.sync="addDialogVisible" @close="addDialogClosed">
      <!-- 内容主体区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="auto">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addUser">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改角色的对话框-->
    <el-dialog title="修改用户" width="50%" :visible.sync="editDialogVisible" @close="editDialogClosed">
      <!-- 内容主体区域 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="auto">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!-- 底部区域 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editUserInfo">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 分配权限对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defkeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      //控制添加角色对话框的显示与隐藏
      addDialogVisible: false,
      //控制修改角色对话框的显示与隐藏
      editDialogVisible: false,
      //查询到的角色信息
      editForm: {},
      //控制分配角色权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //所有权限数据
      rightsList: [],
      //树形控制的属性绑定对象
      treeProps: {
        children: 'children',
        label: 'authName'
      },
      //默认选中的节点ID值数组
      defkeys: [],
      //当前即将分配权限的角色ID
      roleId: '',
      //添加角色的表单数据
      addForm: {
        roleName: '',
        roleDesc: ''
      },
      addFormRules: {
        roleName: [{ required: true, message: '角色的长度不能为空', trigger: 'blur' }],
        roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
      },
      editFormRules: {
        roleName: [{ required: true, message: '该项不能为空', trigger: 'blur' }],
        roleDesc: [{ required: true, message: '请输入角色描述', trigger: 'blur' }]
      }
    }
  },
  methods: {
    // 发起获取角色列表的请求
    async getRoleList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res
    },
    //监听添加用户对话框的关闭事件
    addDialogClosed() {
      //resetFields对整个表单进行重置，将所有字段值重置为初始值并移除校验结果
      this.$refs.addFormRef.resetFields()
    },
    //添加按钮，添加新角色
    addUser() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        //可以发起添加用户的网络请求
        const { data: res } = await this.$http.post('roles', this.addForm)
        if (res.meta.status !== 201) {
          this.$message.error('添加角色失败!')
        }
        this.$message.success('添加角色成功!')
        //隐藏角色的对话框
        this.addDialogVisible = false
        //重新获取角色列表数据
        this.getRoleList()
      })
    },
    //展示编辑用户的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询角色信息失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //监听修改角色对话框的关闭事件
    editDialogClosed() {
      //resetFields对整个表单进行重置，将所有字段值重置为初始值并移除校验结果
      this.$refs.editFormRef.resetFields()
    },
    //修改角色信息提交
    editUserInfo() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        //发修改用户信息的数据请求
        const { data: res } = await this.$http.put('roles/' + this.editForm.roleId, {
          roleName: this.editForm.roleName,
          roleDesc: this.editForm.roleDesc
        })
        if (res.meta.status !== 200) {
          return this.$message.error('更新角色信息失败')
        }

        //关闭对话框
        this.editDialogVisible = false
        //获取角色列表数据
        this.getRoleList()
        //提示修改成功
        this.$message.success('更新角色信息成功')
      })
    },
    //根据ID删除对应的角色信息
    async removeUserById(id) {
      //弹框询问是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      //如果用户确认删除，则返回值为字符串 confirm
      //如果用户取消了删除，则返回为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除角色信息失败')
      }
      //提示删除成功
      this.$message.success('删除角色信息成功')
      //获取角色列表数据
      this.getRoleList()
    },
    //根据ID删除对应的权限
    async removeRightById(role, rightId) {
      //弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该角色权限, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      //如果用户确认删除，则返回值为字符串 confirm
      //如果用户取消了删除，则返回为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}
      `)
      if (res.meta.status !== 200) {
        return this.$message.error('删除角色权限失败')
      }
      //提示删除成功
      this.$message.success('删除角色权限成功')
      role.children = res.data
    },
    // 展示分配权限的对象框
    async showSetRightDialog(role) {
      this.roleId = role.id
      //获取所有权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败!')
      }
      this.rightsList = res.data
      // 递归获取三级节点的ID
      this.getLeafKeys(role, this.defkeys)
      this.setRightDialogVisible = true
    },
    //通过递归的形式，获取角色下所有三级权限的ID，并保存到defKeys数组中
    getLeafKeys(node, arr) {
      //如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        //向数组的最后面插入一个或多个元素，返回结果为该数组新的长度
        return arr.push(node.id)
      }
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    //监听分配权限对话框的关闭 事件
    setRightDialogClosed() {
      this.defkeys = []
    },
    //点击角色分配权限
    async allotRights() {
      const keys = [
        //获取已选中的ID数组
        ...this.$refs.treeRef.getCheckedKeys(),
        //若节点可选择，则返回目前半选中的节点
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      //join（）将数组转换为字符串，返回结果为转换后的字符串
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败!')
      }
      this.$message.success('分配权限成功!')
      //获取角色列表数据
      this.getRoleList()
      this.setRightDialogVisible = false
    }
  },

  created() {
    //获取角色列表数据
    this.getRoleList()
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bgtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>